Synthesis and characterization of fully renewable non-isocyanate polyurethanes with clusteroluminescence

Non-isocyanate polyurethanes (NIPU) prepared from renewable resource have attracted much attention and are of great significance for achieving carbon neutrality targets. In this study, a novel carbonated linseed oil was synthesized via a coupling reaction between CO 2 and epoxidized linseed oil , followed by ring-opening polymerization with two bio-based diamines for preparation of fully renewable NIPU. The effects of different bio-based diamines and different molar ratio of cyclic carbonate groups to amine groups on the thermal-physical, mechanical, and chemical resistance properties of the NIPU films were investigated. These chromophore-free NIPU films demonstrated intense luminescence because of clusteroluminescence induced by the formation of urethane groups with restricted molecular movement. This work reports a simple, environmentally friendly strategy for the development of fully renewable NIPU, which could find potential applications in coatings, elastomers , luminescent materials , and other industries.